Ultraviolet photocatalytic degradation of cholesterol on TiO2: secondary ion mass spectrometry
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F17%3A00112484" target="_blank" >RIV/00216224:14310/17:00112484 - isvavai.cz</a>
Result on the web
<a href="https://onlinelibrary.wiley.com/doi/pdf/10.1002/sia.6129" target="_blank" >https://onlinelibrary.wiley.com/doi/pdf/10.1002/sia.6129</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1002/sia.6129" target="_blank" >10.1002/sia.6129</a>
Alternative languages
Result language
angličtina
Original language name
Ultraviolet photocatalytic degradation of cholesterol on TiO2: secondary ion mass spectrometry
Original language description
Cholesterol (C27H46O stated as M) is used as a model of bio-organic contamination, because this compound is in almost every living organism, and its photocatalytic degradation on titanium oxide (TiO2) surface with UV exposure is investigated. Secondary ion mass spectrometry as a surface-sensitive technique is suited to study this degradation process with focus on intermediates. A fragment of M-OH represents the intact molecule of cholesterol and provides its relative concentration on the surface. The intensity of M-OH decreases after 24-h UV irradiation, and the level of degradation is 89% with the pseudo-first kinetic constant of 0.0207min(-1) within 2h. A fragment of MO-H represents an intermediate as one of the cholesterol oxidation products. The irradiation from a bottom in comparison with a top reveals the differences in the mechanism of the intermediate formation through the intensity and the kinetics with values of factor of 1/3 and 30min, respectively. The roles of electrons and holes, primarily generated in TiO2 by UV, and also of superoxide anion radical and hydroxyl radical, as the secondary reactive species, are discussed to illustrate the bottom/top mechanisms.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10403 - Physical chemistry
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Surface and Interface Analysis
ISSN
0142-2421
e-ISSN
1096-9918
Volume of the periodical
49
Issue of the periodical within the volume
4
Country of publishing house
US - UNITED STATES
Number of pages
6
Pages from-to
278-283
UT code for WoS article
000397496800006
EID of the result in the Scopus database
2-s2.0-84981742475